William b



Jan. 3, I szsl W. B. CROWELL DOOR CHECKING DEVICE Original Filed May`l0, 1923 2' Sheets-Sheet l Jan. 3, 1928.

W. B. CROWELL DooR cHEcxING DEVICE original Filed May 10, 1923 2 SheetsfSheet 2 INVENTOR BY J y ATTORNEY to be described constitutes a cushioning or dampening means :tor the zqaparatus, by whiehthe movement or' the piston 16 and parts attached thereto are controlled. :in the central portion ot the plunger cylinder is an enlarged portion 22 in which the internal diameter ot the plunger cylinder is increased in order'to provide a clearance between the plunger and the cylinder walls when thel plunger reaches this part of the cylinder in its upward or downward movement. in order to control the movements ot the plunger, l provide passages in the walls oi the plunger cylinder for the flow ot oil or other liquid from one portion thereoil to another. By regulating the flow ot liquid by suitable means, the plunger and piston movements may be controlled. The oil passages referred to are indicated in the draww ings by the numerals and 25, the passage 24 leading Afrom the upper portion of the plunger cylinder to the enlarged portion, and the passage 25 leading from the lower end oi' the plunger cylinder to the enlarged portion. Regulating screws 2G and 27 are suitably positioned in the base or cylinder head 15 by means of which the openings through the passages may be varied so as to regulate the tlow of liquid through the passages during the operation or' the device. Communicating between the enlarged portion or the plunger cylinder and the chamber at the lower end ot the cylinder 13, is a passage '28 by means of which liquid which may have escaped to the chamber between the cylinder 13 and the plunger cylinder 22,

4may be returned to the plunger cylinder.

The plunger cylinder is closed at its top by means of a cap 29 which provides bearings tor the cylinder rod. 1i". The lower end ot' the plunger cylinder is closed by means ot a cap or al cylinder head 30 which is provided with a slot or other means l'or attaching` the device to a support such as 31, indicated in Figure 1 of the drawings.

Any suitable liquid may be employed to attain the cushioning eilect, such as oil or glyeerine, but I preferably use a lubricating oil `for the reason that this liquid will operate Jfor long periods without requiring attention.

rlhe. invention covered in the. present application is adapted particularly for manual operation, that is, without other application of power to the toggle levers than is attained by hand operation. lt the toggle levers or elevator doors are to be operated by power, however, Vthe apparatus may be employed with a connection for compressed air or other pressure fluid `tor operating the device, which may be supplied by means ci a pipe 32 which is preferably connected so as to pass through the lower cylinder head 15 and to extend upwardly through the chamber between the outer casing 13 and the plunger cylinder walls 22 to a point above the level ot liquid in the device. Without 'fluid pressure operation, however, the pipe 32 may be omitted entirely ii" desired, as will be apparent to those skilled in the art, in which case the opening through the casing will be closed by any suitable closing means, or the pipe 32 may remain connected even though it is not used.

lVhen it is desired to open the elevator doors, the toggle levers are operated in the manner described above7 thereby forcing the piston upwardly, compressing` the spring 19 and movirgy the plunger Q3 upwardly in its cylinder The upward movement oil? the irilunger 23 thus produced traps some ot the oil at the top ot the cylinder 22. The oil which is trapped pas.` to the right tlnough the port leading to the passageway Qi, and passes downwardlyv therethrough past the regulating screw 2G which controls the flow thereof to the enlarged sect-ion 22, thus checking the plunger at the top ot the plunger cylinder, as desired. lliflhen the elevator doors are to be closed, the operator removes the downward pressure ot his hand trom the handle 12, thereby permitting the springl 19 to actuate the piston 1G. The spring 1E) then forces the piston downwardly, together with the parts attached thereto, the plunger 221 passing the enlarged portion 22 o'l thle plunger cylinder into the lower portion thereof where oil is trapped, and istorced through a port leading to the passage Q5, in which the oil passes upwardly and is controlled in its movement therein by the regu` lating screw 2T, by means ot which the cushioning effect, in the door-closing movement, is controlled. The liquid passing the regulating screw 27 returns to the interior ol. thc plunger cylinder above the plunger and will operate immediatrdy to reduce cushioning action again when the elevator doors are lo be opened. By adjusting the regulating screws 2b und Q7, the movement VoilE the liquid through the passages 2i and may be con- A trolled and the cushioning ell'cct in the opening and closing movements ot the door mav therefore be independently regulated. A

It is to be understood that various changes or modifications may be made in the devire described without departing from the spirit or scope oi the invention as dclined in the claims.

liilhat is claimed as new is- 1. In a door check and closer, door closing means, a checking 'device ot unitary structure comprising a. cylinder, a plunger therein, means for operatively connectin one of said parts to said door closing means, and means for attaining restricted tlow oi a liquid from one side of the plunger to the other to attain a substantially uniform retarded movement oi the door near the end portions oi' both its opening and closing movements.

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2. ln a device of the class described, a cyl- `inder adapted to hold a liquid, an enlarged portion in said cylinder intermediate its ends, a plunger in said cylinder adapted for slid `ing movement therein, and means for cans ing a gradual escape ot the liquid fromthe path or said plunger as it approaches either end ci trie cylinder, comprising passage-Ways trom either end oit the cylinder to the said enlarged portion, and means for limiting the area oil said passage-Ways to ei'leot a cushions` ing of the last portion of the movement oit said plunger toward either extreme position. 3; ln a door check and closer,`a checking mechanism of unitary structure comprising a cylindrical casing, a plunger' therein `adapted to move iii-om one end oli' the cylii'ider to theV other, means 'tor by-passing a liquid from end portions oi the cylinder to an intermediate portion thereoil `so aste retard substantially uniformly the movements oi" the door in portions oft its opening and closing movements corresponding to the relative movements of the said plunger in the said r cylinder with respect to the said means for bypassing liquid, and means for regulating Y --jed to lit in both end portions of the cylinder and arranged to be disengaged from both said end portions and to be located in said intermediate portions at one point in its movement in the cylinder, passagevvays in the Walls oi" the cylinder for transferring liquid from one portion ol the cylinder to another during movement oi the plunger therein, and means lor independently regulating the iioiv of liquid in the said passagevvays to produce a gradual escape oi' the liquid :from the path olf said plunger as it approaches either extreme position.

5. In a device o'l3 the class described, a checking or cushioning means comprising a plunger and a plunger cylinder, operating connections between one oitsaid parts and a mechanism to be operated thereby, a spring adapted to move the plunger in one direction, a cylinder casing in which the spring` is located connected vvith the plunger cyliir der so as to form a unitary structure having a space between the cylinder casing and the plunger cylinder in open communication With said plunger cylinder so as to permit passage into and return oi liquid from the so as tocontrol the movements ol said plunger in the end portions of the cylinder, and thereby to cushion the `movements ot the operated mechanism at the ends ott the forward and return strokes.

6. In a door checlr and closer, a checking device comprising a cylinder adapted for holding a liquid, the said cylinder having a portion intermediate its ends in Which the internal diameter thereof is increased, a plungw r in said cylinder `constructed to lit the end portions of said cylinder and having a clearance When positioned in the intermediate enlarged portion, said plunger being arranged to be disengaged trom both said end portions and located in said intermediate portion at one point in its movement in said cylinder, passageways communicating botiveen the ends o'i the cylinder and said en larged portion, and means in said passagc-- Ways ior regulating the passage of liquid therethrough vvhereby the movement ot the plunger in the cylinder toward the ends thereof, corresponding to the initial opening and iinal closing movements ot the door, is controlled.

7. ln a device o' the class described, a cylinder, ripper and lower adjustable heads on the cylinder, a piston in the cylinder, a compression spring above said piston, means i'or regulating the tension oli the spring, a piston i'od attached to said piston, a second cylinder attached to the lower head oli the first cylinder and adapted to hold a liquid therein, said second cylinder having an enlarged portion intermediate its ends, a plunger in the second cylinder attached to 'said piston rod, passageways communicating between the ends of the said second cylinder and the enlarged portion therein, and means for regulating the passage oit liquid through the said passageivays during movement ot the plunger in said second cylinder to retard substantially uniformly the movements olf the plunger.

ln a door cliecl; and cli "er, the fombiiiation ol a cylinder, a rod pa, D axially thru the cylinder, a second cylinder oi smaller diameter mounted with its upper end Within the first-named cylinder so that a space is lett between the second cylinder and the wall of the cylinder to form a reservoir, a plunger mounted on said rod Within the second cylinder and means associated with the second cylinder tor checking the movement ol the plunger in both directions to retard correspondingly the movement o'l the door.

9. In a door check and closer, the combina` llt) tlie saine with the Cylinder, :mtl means een nesting` tlie door with tlie (lushpotto control the movements of the door.

l0. ln :i door Check und Closer, an upright cylinder, the lower end of which forms an oil reservoir, u rod passing axially thru the cylinder, u floor, a. connection between the door and rocl for trnns'terriirij the motion of one to tlie otlieig u doubley noting duslipet attached to the end ot' Suid Cylinder und comprising u second Cylinder ot' Smaller di- :uneter eo-uxiully mounted. on the lower end of the .first eylnnleri u plunger mounted on said rotl und engaging in the Second eylin (ler, un oil passuge connecting the tiret eylin- (ler with the Second cylinder, und ine; ns Yfor returtling tne movement ot' the plunger to retard Correpoinlingly the movement o't the door. o

ll. In u, door cheek und closer for controlling 'the movements of a floor, .in coinbinution, a member in which energy is stored during the opening; movement of the. door to Serveur@ the cloning force.y u Checking meehunism eon'iprising :i Cylinder und plunger therein, means iter connecting Suid plunger to tlie door, und means; for attaining re- Stricted lion ot u liquid. out ol the putli oli the advancing plunger use it neun-z the end portion ot both its floor openingY :intl door closing Qtrolies, Suid menne comprising pus sages in the ull ot miel cylinder tlnu which the liquid muy llo i nt u rute dependent upon the Size o Suid pul'snges,

l2. In u door cheek and closer lor eel trolling the movements of u doorl` in com liinution, n member in which energyv is stored duringl the opening' movement ol the door to Serve un, the elorsing 'l'oree` u elieeliinggj iuee|1- nnif'iu eonipriging n vylintler :unl plunger therein, menne: For operatively vonnee'ingg one of Suid purtS to the door :unl ineens for attaining' retriet-ed lilou' of u liquid outl of the nulli. o'l the plunger :intl from one side oiE said plunger to the other ne the door -neurS the en@L port-ion olf both itnw opening 

